Improvement in machine for sharpening saws



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.ioHN i ATKINSON noarnwiok, or PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 105,543, dater-l .Tulfl/ 19,.1S 7 0.'

:Mr novniwnwn m MACHINE. ron sI-IARPENING saws.r

The Schedule referred te in thaseLottars Patent and making part o f 'che same.

` I, J onN ArmNsoN Bon'rnwicn, of Philadelphia, ounty of Philadelphia, State ofPennsylvania, vhave uvented an Improved Machine-for Sharpening Saws, Svc., of which the following is'a specification.

.Ziature and Object of the Wention, f

My invention consists iu the combination with a sawor4 other instrument, arranged on its permanent bea-rings, of a vrotary sharpening-tool or-cntter, turning on bearings on a swinging frame, bywhich the eutter'issupported, adjacent-to the said instrument,

c au be adjusted to andf'operated inany Idesired position, the necessity of removing and-replacing the saw or other instrument, whenever it has" to be sharpened, being thus avoided.

lDer'maptt-ntof the ccomjidaying Drawing. Fignre'l is a perspective view of. my improved machine, showing the saine arranged for sharpening the teethof acircular saw. jE

Figures 2, 3, and 4, detached views, partly in section,

`of' parts Aof the machine,

General- Deccript-iom A is a `grindstone or' cntter, of emery, corundrum or other material, the `edge `of which, in the present instance, is leveled fi'omlone side.

'The cutter is securedgtoa spindle, a, whichturnsin a bearing at one side `of a frame or holder, B, and is" supported ,at'the `inner` end by a center-screw, c, passing through the opposite side ofthe iame.

The frame Bisprovided with a handle, B', and issuspended by aswinging frame inV a position adjacent to a saw or other'instrument, which may, fromtime to time, require tothe sharpened.

This swinging frame,` in the present instance, is suspended from a hanger, G, secured in a iixed position abovethe instrument tol be sharpened, centerscrewsff, which pass through arms g-g of the hanger,

`affording abearing for shaft, h,"and Supporting a yoke, G.

An extension bar, D, consisting of a ltube and a r rod, vadjustable in the same, and secured by asetscrew,.is connected at its upper end :by a universal 4joint to the yoke O, as shown in ig.' 2,'and a yoke, ,-F, is secured to thelowerV end ofthe-bar D, and is` connected to a yoke,v E, byjcenterfscrews d, the pointed ends of which serve as bearings for a shaft,

The frame/B is connected to the yoke G' bya pin i or bolt,k, on which the said frame can turn freely,

and to the yokes G and F are secured platesm m', 'having curved slots u n; through whichset-screws o c. pass into the yoke E and frame B, as shown in figs. 1 and 4.

A rotary motion inthe direction'of its arrow isiniparted to the shaft h from any. adjacent driving-shaft,

and is communicated to the shaftst and a by belts p In 'the present instance the machine is illustrated as varranged 'for operating' on a circnlprsaw, x, the teeth of which may, fromtime to time, require to bc sharpened. Whenthis operation is to be performed, the said frame being s 'o'constrilcted` thatthe cutter the machine is brought to the position shown in iig. 1. Theoperator grasps the handle B', and,.adju sting the frame B as may be necessary, applies the cutter' i A to one of' the saw-teeth, which is speedily reduced to the desired form; thesaw is then `turned sons to bring the next tooth to 'the proper position, and the .operation is repeated.

Owing to the numerous joints in the hanging frame of the machine, the cutterlnaybe turne'd to any position',l and may be passed iu any direction over or apV plied'at any angle to the edge of the saw; but the A movements of the cutter in one or more directions may belimited if desired; for instance, by turning the screw '0, so as to clamp' the plate 11:,afteiftlie'frame Bv has been turned to any position on the pink, iig. 4, thev frame is secured iu the said position, so that.the cut-I ter, when applied successively to the sawteeth, will.

impart to all the-same angle, while the yoke E may be secured in any position by the screw o' to limit'the downward movement of the cutter, and insurethe 'cutting of the teeth to a uniform depth. While -these movements of'parts of the frame are limited, the' entire frame maybe freely-swung to any position required to apply the cutter properly to the teethy the saw. Y i

Shouldthe belt 1) be too light or too slack, or should the sawx be replaced by another ot' a dil'ereut size, 1

the extensionarm 'D 1n 'a`yfbelengthened orshortened, accordingly-: 'A

y Afterthe -saw` has jbeen sharpened,r the machine may bei swung upward and secured in a position nea-1' the ceiling of the apartment, where it will not interl fere vwith the usual operation of the saw, but `will.jbe

in a position to be instantly brought into servicewhen the saw has to be sharpened.

By' the combination witha saw. or other instrument, I

arranged on its permanentbearings, of a rotary cutter, so suspended that, )vithoutinterfering with the ordinary operations of the instrument, it can be at any time applied' to the same, the necessity Aof fre-'- quently removing and replacing theinstrumenttc sharpen it, or of employing it' iu a. dull condition to to avoid such removals, is obviated.

Although the machine has been shown as arranged mi, i

. to operate on a circular saw, it may (either constructed as described or in a modilied form) be employed Jwith other implements which require repeated sharpening or grinding.

A spring, y, secured to the yoke Ii, and, extending below the yoke E,'will tend to hold the latter and the frame B in a horizontal position without preventing them from being depressed on the application of pressure, or a suitable counter-weight may be applied Yto anarm extending from the yoke E.

I do not limit myself' to any special form -of swinging-frame, as its construction will depend to a great .extent on the character of the movements to he im- I do not claim broadly a cutting or other tool, tnrning in 'bearings on an adjustable or jointed frame, so that'the said tool can be applied while rotating to any vdesired portion of an instrument or article to be sharpened, ground, or polished; but t I claim- The rotary cutter A, its jointed frame and drivingbelts, operating substantially as described when the whole is permanently suspended above, and arranged, in respect to a. circular saw or other cutting instrument, so that' the cutter can be applied to the instrument without removing the latter from its permanent bearings.

In testimony whereof I have signed my name to this specification in the pesence of two subscribing witnesses.

' JOHN ATKINSON BORTHWIGK.

Witnesses: y

FRANK B. RICHARDS, Louis Bosvvmm. 

